Doorcheck



A. B. CLARK June 9, 1931.

DOORCHEGK Filed May 27, 1929 2 Sheets-Sheet 1 ('lbtomeqo.

June 9, 1931. A. B. CLARK 7 1,308,837

DOORCHECK Filed May 2'7. 1929 2 Sheets-Sheet 2 Patented June 9, 1931 UNITED *STATES P TENT OFFICE ANDREW BnCLARK, or rHontnsvILrn, GEORGE, AssIeNon ononn-n L-r r nosooE LUKE, OF THOMASVILLE, GEORGIA I noononn'ox Application filed May 27,

This invention aims to provide a novel means for checking the closing movement of a door, and to provide novel means for bringing about a closing ofa door. -It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains. i

A preferred form of the invention has been shown in the drawings, but it will be understood that a mechanic, working within the scope of what is claimed, may make such changes as his skill may suggest, without departing from the spirit of the invention.

In the accompanying drawings:

Figure 1 shows in elevation, a device con-- structed in accordance with the invention, mounted on a door; 7

Figure 2 is a top plan, wherein the door and the door jamb are shown in section;

Figure 3 is a longitudinal section of the device, some parts remaining in elevation;

Figure 4 is a fragmental sectional view showing parts as they will appear whilst the door is being opened, the clutch being disengaged from the nut, the shaft sliding freely, and the nut rotating with the shaft;

Figure 5 is a view similar to Figure 4, the parts being in the positions which they will assume whilstthe door is being closed, the

clutch being engaged with the nut, and rotation being imparted to the screw rod;

Figure 6 is a cross-section on the line 66 of Figure 5;

Figure 7 is a perspective view of the clutch;

Figure 8 is a perspective view of the nut;

Figure 9 is a perspective view of the in ner sleeve. I

The numeral 1 marks a door frame and a door 2 is hinged at 3 to the door frame 1.

A trough-shaped bracket 4 is secured to the door frame 1. In the side Walls of the bracket 4 is journaled a ball 5 on one end of a screw rod 6. a p

The screw rod 6 carries a brake drum 7. The brake drum 7 is adapted to be engaged by a trough-shaped foot 8 on one end of a resilient brake arm 9, the arm '9 being reversely curved intermediate its ends, as shown at 10, to enhance its resiliency. The

1929. Serial No. 366,416.

inner end of the arm 9is secured at 11to the bracket 4. A screw 12 is threaded into the bracket 4 and engages the arm 9. The screw stud 16 is held in the cap 15 and is pivoted l 17 to a bracket 18 secured to the'door 2.

The numeral 19 designates a nut which may be said to be threaded upon the screw rod 6, because the nut has internal projections 20,

I engaged in spiral grooves 21 formedin the screw rod 6. On one end, the nut '19 is provided with clutch elements 22 adapted to cooperate with clutchelements 23 on a clutch member 24.

The clutch member 24 is mounted for swinging movement, and is held againstrotation. To this end, the clutch member 24 has aflange 25 attached-by screwing elements 26to an outer sleeve 27 disposed withinthe holder 14. Inside ofthe'sl'eeve 27 is located an inner sleeve 28 whichhas a base 29 of considerable thickness, this base, and the tu- 1 bular clutch member 24, forming bearings in which the screw rod 6 is mounted for rotation. A retaining device 30, such as a screw, connects the holder 14 with the outer sleeve 27 andwith the inner sleeve 28, and a" retaining'device 31 is engaged with the inner sleeve 28 and passesinto the base 29 of the inner sleeve 28; Thus the sleeves 27' and 28 are secured to the holder 14, the clutch member 24 is held against rotation, and the said Suppose that the door 2 is closed, parts being in the solid line position of Figure 2, and n the position shown in Figure 5. When the door 2 is opened, the door exerts a pull on the rotation, and the screw rod Go an; slide longiholder 14 and draws the clutch 24 out of engagement with the clutch elements 22 of the nut 19, the parts then being in the position shown in Figure 4. The screw rod 6 slides 'freely through the clutch member 24, and the nut 19 turns with thescrew rod 6. Although the holder 14 at this time is'moved toward the top of Figure 4, the nut 19 isnot carried toward the top of Figure 4 to bring the clutch i ing this time, the spring elements 22 and 23 into engagement. This is so because the screw rod 6 does not move lengthwise when the holder 14 moves toward the top of Figure 4, and the projections on the nut 19 (Figure 6) cooperate with the spiral grooves 21 on the screw rod 6 to hold the nut 19 back in the position of Fig- 'ure 4 in engagement with the base 29. The tubular holder 14 has free longitudinal sliding movement with respect to the screw rod 6, whilst the door is being opened, and dun.- 34 is putunder tenslon. V V 5 I .Suppose that the door is open in the dash 3 line position of Figure 2, that the nut 19 and the clutch 24 are in the position shown in "Figure 4, and that the operator lets'go oi the door. Then the spring 34 reacts and closes the door, and the holder 14 is moved longi tudinally a little from the position ofFigure. 4 to-the position of Figure, 5 to bring the clutch elements 23 of the member-24, and the clutch elements 22 of the'nut 19 into engagement. In this way, the nut 19 (in the position shown in Figure 5) is held against tudinally through the nut 19. with a rightline sliding'movement, because the projections 20 on thenu't have tov ride in the spiral 1 i grooves 21 of the screw rod 6. The screw rod 6, therefore, is caused to turnwitli considerable friction, the ball 32rot'ating in the socket 33, and the ball 5 rotating inthebraclget I 4, the closing movement-of the door'2 bejng checked accordingly.

. By the time that the door hasbeen f swung almostto a closed position, the brake drum 7 of the screw rod6comes1i-ntocontactwith thefoot 9 of the brake arm 9 of the bracket 4. The rotation ofthe screw rod 6, therefore, becomes ,morefdifiicult, and the door gets a final check ju-st'beforeit closes. The operator can advance the screw 12 to shift the brake :arm 9,. and, to regulatethe force with which the foot 8 bears on the brake arm 7...

7 Having thus described the invention, what is claimed is: 1. In a check for swinging doors,1co0,perating members comprising a holder and a. screw, means for mounting said cooperating the screw, said cooperating members having relative right line movementin one direction to bring the nut into end engagement with one of said cooperating members for rotation therewith-and for, threaded movement along the screw when the door is opened, said cooperating members having relative right line I movement in an opposite direction, when the door is closed, to eflfect. an end spacing of the nut and that oneofthe-said'cooperatingmembers with which the nut is brought into engagement as aforesaid.

2. In a check for swinging doors, a holder,

means for mounting the holder for swinging movement but against rotation, a clutch secured to the holder, a screw slidable in the clutch, means-for mounting the screw for swinging movement, and a free nut threaded ANDREW BI CLARK.

members for swinging movement andfor V holding. one of them against rotation, and a free nut threaded on the'screw and having threaded 'movementwith respect to one of saideooperating members longitudinally of 

